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Shares of Minneapolis casual dining entity
Buffalo Wild Wings(BWLD - Get Report) soared 22% to $31.55. The company announced in-line earnings per share of 36 cents, vs. 31 cents a year ago. The EPS figure included a 2-cent charge related to restaurant relocations. The company also guided for a 25% increase in net income for 2008. KeyBanc Capital Markets and Cowen both upgraded the stock to buy and outperform ratings, respectively.

Also rising,
Align Technology(ALGN - Get Report), which offers the Invisalign treatment for crooked teeth, jumped 18% to $12.18. Barrington Research upgraded the Santa Clara, Calif., company to market perform from underperform after a solid earnings beat. The company announced first-quarter profit of $5.3 million, or 7 cents a share, vs. $7 million, or 10 cents a share, a year ago. Analysts were looking for EPS of 3 cents.

Computer systems maker
RadiSys(RSYS - Get Report) shot up 21% to $9.83. The Hillsboro, Ore.-based firm announced non-GAAP first-quarter income of $57,000, or breakeven a share, for the first quarter, vs. a profit of $702,000, or 3 cents a share, a year ago. Analysts polled by Thomson Financial were looking for a per-share loss of a penny. The company also forecast non-GAAP second-quarter EPS between 6 cents and 11 cents. The Street is looking for earnings at the low end of that range.

Tronox(TRX), which makes titanium dioxide pigment, climbed 22% to $3.53 after narrowing its loss to $200,000, or a 3 cents a share, from $9.4 million, or 22 cents a share, a year ago. Revenue increased to $349.1 million from $339.1 million a year ago.

Among the losers,
Crystallex(KRY) shares plummeted 46% to 90 cents. Shares stopped trading briefly before the Toronto miner of Venezuelan gold announced that Venezuela's Ministry of the Environment and Natural Resources has denied a request for authorization to carry out exploration activities in the Las Cristinas mining area, where Crystallex hopes to continue development.

Shares of
Savvis(SVVS), a Town & Country, Mo., provider of information technology services, lost 23% to $14.31. The company suffered a triple downgrade from Lehman Brothers, Jeffries and Kaufman Brothers to hold-equivalent ratings after forecasting 2008 revenue between $840 million and $870 million, below the consensus estimate of $905.5 million.

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